CN1203879A

CN1203879A - High Speed Folding Unit for Fillable Food Packaging Machines

Info

Publication number: CN1203879A
Application number: CN98115131.0A
Authority: CN
Inventors: P·方塔纳兹
Original assignee: Tetra Laval Holdings and Finance SA
Current assignee: Tetra Laval Holdings and Finance SA
Priority date: 1997-06-27
Filing date: 1998-06-26
Publication date: 1999-01-06
Anticipated expiration: 2018-06-26
Also published as: DE69734148T2; ATE303947T1; AR014361A1; BR9802283A; US5966899A; EP0887261B1; DE69734148D1; CN1105667C; TW365592B; ES2248838T3; JP4162765B2; RU2161582C2; TW443292U; EP0887261A1; HK1017651A1; JPH1170905A

Abstract

A high-speed folding device (1) for producing sealed parallelepiped-shaped packages (2) containing a fillable food product, the device has a continuous conveyor for feeding the packages (3) along a forming path (B) Conveyor (21), multiple folding mechanisms (24, 25, 26) arranged along the forming path (B), a heating mechanism (27) and a final pressing mechanism (28), the folding mechanisms (24, 25, 26 ) and the final pressing mechanism (28) have a plurality of parts (44, 50, 55, 58, 70, 71, 72) interacting with the package (3), their dimensions are fixed, and due to the conveyor (21) The movement cooperates with the package (3).

Description

The high-speed folding unit of pourable food product packaging machines

The present invention relates to the high-speed folding unit that a kind of wrapping machine is used, this wrapping machine is used for producing the aseptic sealed packages part that contains pourable food product continuously from packaging material tube.

Many pourable food products such as beverage, fruit juice, pasteurization or UHT (uht) milk, wine, tomato sauce etc., be in the package of making by the packing of sterilization, to sell.

A kind of like this exemplary of package is with the known parallelepiped-shapepackage package container of the name of Tetra Brik Aseptic (registered trade mark (RTM)), be used for liquid or pourable food product, this packing container forms by folding and sealing winding shape packing.

The web-like packing comprise several layers of lamination coating such as paper, its both sides cover heating plastic material such as polyethylene; And packing one side of final contact food also comprises one deck barrier layere such as aluminium foil in package, also covers one deck thermoplastic material on it.

As everyone knows, the package of the above-mentioned type is produced in device of full automatic packaging, and the packing of supplying with from belt-like form in wrapping machine form a continuous pipe.Strip of wrapping material is sterilized in wrapping machine, for example by coating hydrogen peroxide and so on chemosterilant; After the sterilization, remove disinfectant, as pass through heating evaporation from the surface of packing; The strip of wrapping material that to sterilize like this remains in the osed top gnotobasis then, and longitudinally folding and sealing and form a pipe.

This pipe is filled food sterilization or that disinfected, and in the sealing of the transverse part office of equi-spaced apart, is cut to the pillow-like package in this cross-section then, subsequently it mechanically is folded into the finished product packing spare of parallelepiped-shaped.

Above-mentioned wrapping machine is known, and wherein the pillow-like package is folded into the package of parallelepiped-shaped by folding device, and this folding device consists essentially of: a conveyer is used for along forming path stepping ground feeding package; A plurality of fold mechanisms of settling along forming path; A heating component acts on the treating on the folded portions of each package, so that melt these parts and it is sealed on the corresponding wall of this package; And a last hold-down mechanism, cooperate with each package, during with the cooling of these parts of box lunch with thermosealed partial fixing on corresponding wall.

More particularly, folding device and last pinch device comprise a plurality of mutual action parts, they along forming path settle and can towards with move with leaving the load-transfer device stepping so that the package that is traveling on the load-transfer device is carried out corresponding shaping operation.

The major defect of known folding device is a stroboscopic motion, it is characterized in that one after the other braking and resetting load-transfer device and mutual action parts, when capacity rating improved, this caused the violent deceleration and the acceleration of movable parts, and produced dynamics problem when being equal to and greater than given full output.

The failure-free high-speed folding unit that the purpose of this invention is to provide a kind of pourable food product packaging machines, be designed for overcome known folding device usually with above-mentioned shortcoming.

According to the present invention, the high-speed folding unit that provides a kind of machine of packing pourable food product to use, this device comprises:

Supply with station for one, be used to supply with a series of leak free pillow-like packages that contain described food, each package has a plurality of folded parts, prepares to fold and be sealed on the corresponding wall of package, to form the package of corresponding parallelepiped-shaped;

Conveying mechanism is used for along the described package of forming path feeding, and this forming path extends to the output station from described supply station;

Fold mechanism cooperates along described forming path setting and with each described package, so that finish the respective folded operation to package;

Heating arrangements acts on the described folded part of each described package, to melt described folded part and it is sealed on the corresponding described wall; And

Last hold-down mechanism cooperates with each described package, when cooling off with convenient folded part corresponding described folded part is fixed on the corresponding described wall;

It is characterized in that described conveying mechanism is continuous; And described fold mechanism and described hold-down mechanism comprise the interactional mutual action parts of a plurality of and described package, and they have fixing size, and cooperate with package by means of the motion of described conveying mechanism.

Describe an embodiment who does not preferably provide constraints of the present invention below as an example with reference to the accompanying drawings, in the accompanying drawing:

Fig. 1 represents the decomposition diagram of the high-speed folding unit of a kind of pourable food product packaging machines of the present invention;

The top perspective view of the amplification of Fig. 2 presentation graphs 1 device has for clarity sake saved some parts;

The bottom perspective view of the amplification of Fig. 3 presentation graphs 1 device has for clarity sake saved some parts;

The schematic front view that the pillow-like package is folded into the preferable process of parallelepiped-shaped package that Fig. 4 to 8 expression is finished by Fig. 1 device.

The high-speed folding unit that a kind of wrapping machine (not shown) of label 1 expression among Fig. 1 to 3 is used, this wrapping machine is used for producing the aseptic parallelepiped-shaped package 2 of leak free (Fig. 8) continuously from known package tubes of material (not shown), but this package 3 contain the food of can such as pasteurization or UHT milk, fruit juice, wine or the like.

This pipe is to form by longitudinally folding and seal the known band (not shown) of being made by the heat-sealing sheet material in the upstream of device 1 in a known way, the band of this sheet material comprises several layers of lamination coating such as paper, on outside one side of its final formation package 2, scribble one deck thermoplastic material such as polyethylene, and on the side of its final contact food, scribble one deck thermoplastic material and one deck barrier material such as aluminium foil, scribble thermoplastic material on the aluminium foil again.

Packaging material tube is filled the food as package object then, in the sealing of the transverse part office of equi-spaced apart, and cut into many pillow-like packages 3 (Fig. 4) along these lateral parts, and then it is delivered to device 1, at this place that it is folding and form corresponding package 2 with mechanical means.

With reference to Fig. 4, each package 3 has an axis A, and comprises main portion 4 and the opposed top and the bottom part 6,7 of a parallelepiped-shaped, and two end portions 6,7 potted line separately 8,9 perpendicular to the axis A of package 3 on the main portion 4 is gradually narrow.

More particularly, the main portion 4 of each package 3 is formed by pair of planar rectangular wall 10 and a pair of planar rectangular wall 11 that extends between wall 10 along side direction, and this is 10 parallel to each other to the planar rectangular wall, A and be parallel to potted line 8,9 parallels to the axis.

Each end sections 6,7 becomes the wall 12 of isosceles trapezoid to limit by a pair of basically, this a pair of wall 12 tilts slightly with respect to the plane vertical with axis A toward each other, and has square limit that the respective edges by the wall 10 of base portion 4 limits and by corresponding potted line 8,9 interconnected long limits.

Each package 3 also comprises the

fin

13,14 and a pair of leg-of-mutton basically

part

15,16 of an elongated substantial rectangular of stretching out from corresponding potted line 8,9 to each end sections 6,7, the latter is along laterally stretching out from the opposite sides thereof of main portion 4, and limited by the end of corresponding wall 12.

For forming package 2, the two end portions 6,7 of 1 pair of package 3 of device compresses toward each other, make corresponding

fin

13,14 is folded on the end sections 6,7, and with the part 15 of end sections 6 folding and be sealed in corresponding wall 12 on, and the part 16 of end sections 7 is folding and be sealed on the corresponding wall 11.

Referring to figs. 1 through 3, device 1 comprises: a bearing support 20 (disconnect downwards in Fig. 1 and be expressed as its component part); A chain converyer 21 that is installed on the bearing support 20 is used for along forming path B package 3 being fed into output station 23 continuously from supplying with station 22; A plurality of

fold mechanisms

24,25,26 cooperate in the fixed position and with package 3 on the bearing support 20 that they are installed in along path B and finish respective folded operation to package; Heating arrangements 27 acts on the part that is folded 15,16 of package 3, is sealed on the

corresponding wall

12,11 with

puddle

15,16 and with it; And last hold-down mechanism 28, cooperate with individual package 3, when

part

15,16 coolings,

part

15,16 is remained on the

corresponding wall

12,11.

More particularly, conveyer 21 comprises at least one gear (driving gear 29 and a driven gear 30 are shown in an embodiment) and a pivotally attached chain 31, this chain 31 around

gear

29,30 and with its engagement, and many planar rectangular blades 32 are housed, each blade stretches out from chain 31, and cooperate with the respective wall 10 of separately package 3 and promote this package 3, so that along path B feeding package.

More particularly, chain 31 comprises that a straight horizontal top segmentation 33, is arranged essentially parallel to the bottom segmentation 34 of segmentation 33, and the

C shape part

35,36 of two bendings, C shape

part

35,36 is configured to its concave surface and faces one another and connect

segmentation

33,34, and the intermediate portion defines respectively and supplies with station 22 and output station 23.

Path B comprises the straight main portion B1 and two corresponding the supplies and output end sections B2, B3 that are limited by the segmentation 33 of chain 31, and end sections B2, B3 are limited by respective tops part 35a, the 36a of the

part

35,6 of the chain 31 that extends between

corresponding station

22,23 and segmentation 33.Therefore part 35a, the 36a of segmentation 33 and

part

35,36 form the conveying segmentation of chain 31, are used for package 3 is fed into station 23 from station 22; And remainder 35b, the 36b of segmentation 34 and

part

35,36 form the segmentation of returning of chain 31, are used for blade 32 is fed into 2 22 from station 23.

Chain 31 comprises many pivotally attached attaching partss 40 that limited by smooth rectangular plate, vertically stretches out corresponding blade 32 from rectangular plate.More particularly, each blade 32 stretches out from corresponding attaching parts 40 asymmetricly, and attaching parts 40 is divided into along the different rectangle part 41,42 of two length of path B, and they are arranged on the upstream and downstream of blade 32 respectively along path B.More particularly, along path B, part 41 is longer than part 42.

Each attaching parts 40 also separates slightly with respect to adjacent attaching parts 40, forms corresponding gap 43 thus, and its purpose is narrated later on.

Because the structure of conveyer 21, blade 32 vertically is provided with along the part B1 of path B, then is horizontally disposed with at

station

22,23.

Each package 3 is located on conveyer 21 like this, make the conveying segmentation of its end sections 7 contact chains 31, an one wall 10 is leaned against on the corresponding blade 32, make axis A be parallel to blade 32, thereby the

part

15,16 of each package 3 is extended transverse to path B.

Package 3 also is fed on the conveyer 21 with horizontal input position, and wherein end sections 7 contacts the part 42,41 of adjacent attaching parts 40, and fin 14 is inserted in the corresponding gap 43 loosely.Equally, each finished product packing spare 2 shifts out from conveyer 21 with the horizontal output position.

Fold mechanism 24 comprises an elongated guide 44, to be installed in the fixed position on the bearing support 20, in the face of the conveying segmentation of chain 31 and above it, and extend at the connection B1 of path B and that part place of two parts of B2, and define a recessed apparent surface S towards chain 31, this surperficial S cooperates with the end sections 6 of each package 3 towards conveying segmentation convergence and with sliding type, thereby compresses and flatten end sections 6 towards chain 31.

Guiding parts 44 comprises a plurality of parallel elongate curved sections 45, and they are connected mutually securely by the link 46 with each section 45 traversed by; And two sections 45 that extend at guiding parts 44 transverse ends places comprise corresponding both ends part 47, and they longitudinally stretch out towards station 23 with respect to other section 45.

Folding device 25 comprises a pair of relative parts 50 that formed by parallel elongated sections, they are installed on the bearing support 20, the corresponding opposed horizontal two edges 51 of the segmentation 33 of contiguous chain 31, and cooperate with the end sections 7 of each package 3 with sliding type, so that fin 14 is folded on the corresponding wall 12, and part 16 is folded on the corresponding wall 11 of main portion 4 of packing 3.

More particularly, each relative parts 50 comprises the straight centre portion 52 of a segmentation 33 that is parallel to chain 31, the upstream portion 53 of 33 bendings of extending from middle part 52 towards segmentation, and the downstream part 54 of guiding parts 55 from middle part 52 towards fold mechanism 26 bending that is arranged on fold mechanism 25 tops of extending.

After at first utilizing parts 90 fin 14 to be folded on the corresponding wall 12, the upstream portion 53 of parts 50 cooperates with the end sections 7 of each package 3 with sliding type relatively, towards respective wall 11 folded parts 16 of package 3; The centre portion 52 of parts 50 cooperates with the part 16 of each package 3 with sliding type relatively, make the corresponding wall 11 of part 16 in the face of package 3, and downstream part 54 cooperates with part 16 with sliding type, and they are contacted with wall 11.

Guiding parts 55 is formed by the section of an elongated U-shaped basically, it is installed on the bearing support 20, its surface of position to the segmentation 33 of chain 31 and above it, 44 extend downstream along path B from guiding parts, and cooperate with the part 15 of the end sections 6 of package 3, they are folded on the corresponding wall 12.

Guiding parts 55 comprises a pair of elongated relative arm 56, basically above the respective lateral edge 51 of the segmentation 33 of corresponding parts 50 relatively and chain 31, extend, also comprise one with path B traversed by the connecting bridge 57 of the respective downstream end of connecting arm 56.

Fold mechanism 26 also comprises a forming rolls 58, this roller has an axis perpendicular to path B, be installed on the bearing support 20 this roller idle running, between two arms 56 of guiding parts 55, and has an opposed rounded ends surface 59 towards two arms 56, and with the corresponding seat of arm 56 qualifications, the part 15 of each package 3 can be slided therein.

Arm 56 respectively comprises along path B: first targeting part 60, and they are dispersed with respect to the segmentation 33 of chain 31, and assemble relative to one another, so that the part 15 of each package 3 is rotated toward each other; Second targeting part 61, parallel to each other and be parallel to segmentation 33, and be arranged to respective end surface 59 in the face of roller 58, so that part 15 contacts with end surface 59; The 3rd targeting part 62 is parallel to segmentation 33 and also assembles toward each other, with end sections 6 folded parts 15 towards package 3; And the 4th targeting part 63, parallel to each other and be parallel to segmentation 33, be used for part 15 is remained on the position that get in the output place of the 3rd targeting part 62.At last, the part 57 of guiding parts 55 cooperates with the part 15 of each package 3 with sliding type, thereby they are contacted with the end sections 6 of package 3.

With reference to Fig. 2 and 3, bearing support 20 comprises a pair of fixing sidepiece 64 (only illustrating), be used for laterally keeping package 3 along path B, they are arranged on the opposite sides thereof of the conveying segmentation of chain 31, and between station 22 and last hold-down mechanism 28, extend, mechanism 28 is arranged on the tight downstream of

fold mechanism

25,26 along path B.

Referring to figs. 1 through 3, heating arrangements 27 comprises: an air heating component 65 that is installed on the bearing support 20; A pair of first nozzle 66 that is connected on the assembly 65 is arranged between the targeting part 63 of arm 56, so that before the part 57 of part 15 arrival guiding partss 55 hot air is directed on the part 15 of each package 3; And a pair of second nozzle 67 that is connected assembly 65, be arranged between the centre portion 52 of relative parts 50, so that before the downstream part 54 of the relative parts 50 of part 16 arrival, hot air is directed on the part 16 of each package 3.

Last hold-down mechanism 28 comprises three

endless belts

70,71,72, they be installed in corresponding each on the belt pulley 73, be installed on the bearing support 20 belt pulley 73 idle runnings,

belt

70,71,72 angle at 90 degrees to each other is provided with, and between them and with the segmentation 33 of chain 31, form a formed channel (in Fig. 8, representing), and define the profile of the finished product packing spare 2 of separating device 1 with P1 with constant square-section.In the example that illustrates,

belt

70,71,72 and corresponding belt pulley 73 are installed on the top section of bearing support 20, but also can be installed on the base section of bearing support 20.

More particularly, two (70,71) in the described belt are positioned on the opposite sides thereof of segmentation 33 of chain 31, and comprise the level and

smooth effect segmentation

74,75 that faces one another separately, and they are perpendicular to segmentation 33, and extend along the extension of sidepiece 64 separately basically.

Belt 72 is positioned at blade 32 tops, comprises an effect segmentation 76, this segmentation be parallel to conveyer 21 segmentation 33 and perpendicular to the

effect segmentation

74,75 of

belt

70,71.

There is the salient 77 of a plurality of shaped equi-spaced apart in the outside of belt 72, cooperates with the part 15 of each package 3 with sliding type, and part 15 is pressed on the smooth end sections 6 this moment of package 3.

The outside of belt 72 also has a plurality of elongated salients 78 perpendicular to path B, be arranged between the shaping salient 77, when conveyer 21 advances, elongated salient 78 and respective elongated perforate 79 engagements that on the free end edge of respective vanes 32, form, thus make the motion of belt 72 and chain 31 synchronous.Select as another kind,

belt

70,71 can form in the mode identical with belt 72, has the salient that is similar to salient 77,78.

As can be clearly from above-mentioned explanation, according to key character of the present invention, guiding

parts

44 and 55, relative parts 50, roller 58 and

belt

70,71,72 all have fixing size, and because the motion of conveyer 21 and cooperating with package 3.

Referring now to the operation of package 3 tracing devices 1, from moment with horizontal input position feeding package 3 on the respective vanes 32 of conveyer 21, make end sections 7 fin 14 with 43 engagements of corresponding gap.

By means of the thrust that moves and apply of blade 32, package 3 tilts and finally begins the place at the part B1 of path B to stand upright in the upright position along the part B2 of path B; In this motion, the end sections 6 of package 3 cooperates to parts 44 with sliding type, and as mentioned above, guiding parts 44 has a profile of assembling towards chain 31, therefore compresses end sections 6 and makes its flatten (Fig. 5).

When the end sections 6 of package 3 arrives the end sections 47 of sections 45 or soon afterwards, the upstream portion 53 of the relative parts 50 of end sections 7 contacts of package 3; When package 3 slided facing to parts 90, fin 14 was folded on the end sections 7, and end sections 7 is driven plain; And when package 3 slided along the part 53 of relative parts 50, part 16 was rotated (Fig. 6) towards the respective wall 11 of package 3.

Subsequently, the part 15 of the end sections 6 of package 3 arrives the targeting part 60 of arm 56, and they upwards turn to a vertical position parallel to each other at this place; At this some place, part 15 is logical giving between the end surface 59 of the targeting part 61 of arm 56 and forming rolls 58, and is further folding towards the wall 12 of end sections 6 by the targeting part 62 of arm 56.

When between the guide part 63 of package 3 at two arms 56 and when advancing between parts 4 centre portions 52 relatively,

nozzle

66,67 guides on the

corresponding part

15,16 hot air partly and partly to melt the thermoplastic material layer of

cover part

15,16; And when package 3 slided below the part 57 of guiding parts 55 and between the downstream part 54 of relative parts 50,

part

15,16 was folded on the

corresponding wall

12,11 at last.

At last, package 3 is subjected to the promotion of conveyer 21 by the motion of passage P1, the segmentation 33 of this passage P1 conveyer 21 and the effect segmentation of

belt

70,71,72 74,75,76 limit, in this passage, 15,16 coolings are sent out by portion, and owing to the pressure that acts on above them is sealed on the

corresponding wall

12,11, thereby form finished product package 2 (Fig. 8).

Can know the advantage of device 1 of the present invention from above-mentioned explanation.

Particularly, device 1 continuous handling can solve the dynamics problem that produces owing to the suffered violent acceleration of the movable parts of step operating system and deceleration, so can obtain high delivery rate (as 8000-24000 package per hour).

In addition, different with known folding device, device 1 characteristics are that to have only a power part be conveyer 21, have therefore simplified and have installed 1 control system and bigger reliability is provided, and also simplified the wrapping machine that this device 1 is installed thus and increased its reliability.

At last, owing to all be installed in basically on the conveyer 21 with package 3 interactional parts (44,50,55,58,70,71,72), therefore installing 1 is highly compact.

Obviously, can describe and illustrative device 1 changes and do not depart from the scope of claims this paper.

Claims

1. A high-speed folding device (1) for a machine for packaging fillable food, the device comprising:

A feeding station (22) for feeding a series of sealed pillow-shaped packages (3) containing said food product, each package having a plurality of folds (15, 16), ready to be folded and sealed in the package (3) on the corresponding walls (12, 11) to form a corresponding parallelepiped-shaped package (2);

a conveying mechanism (21) for feeding said packages (3) along a forming path (B) extending from said feeding station (22) to an output station (23);

a folding mechanism (24, 25, 26), arranged along said forming path (B) and cooperating with each said package (3), so as to complete the corresponding folding operation of the package (3);

heating means (27) acting on said folded portion (15, 16) of each said package (3) to melt said folded portion (15, 16) and seal it against the corresponding said wall (12, 11) on; and

Finally a pressing mechanism (28), cooperating with each of said packages (3), in order to fix the corresponding said folded part (15, 16) on the corresponding said wall when the folded part (15, 16) cools (12,11) on;

It is characterized in that the conveying mechanism (21) is continuous; and the folding mechanism (24, 25, 26) and the pressing mechanism (28) comprise a plurality of Interaction members (44, 50, 55, 58, 70, 71, 72), which have fixed dimensions, cooperate with the packages (3) by means of the movement of said conveying mechanism (21).

2. A device as claimed in claim 1, characterized in that said conveying mechanism consists of an endless conveyor (21) which in turn comprises a plurality of pushing elements for corresponding said packages (3) (32), a conveying section (33, 35a, 36a) for feeding said pushing member (32) and said package (3) along said forming path (B), and a conveying section (33, 35a, 36a) for feeding said Said pushing member (32) is fed from said output station (23) to a return section (34, 35b, 36b) of said supply station (22).

3. A device as claimed in claim 2 for folding pillow-shaped packages (3), each package (3) comprising a substantially parallelepiped-shaped main part (4), a first end portion (7) and an opposite second end portion (6), the first end portion (7) tapering from said main portion (4) towards a corresponding sealing line (9) and positioned in contact said conveying segments (33, 35a, 36a), while the second end portion (6) also tapers from said main portion (4) towards a corresponding sealing line (8); for each said end Each said package (3) includes a pair of said folded portions (15, 16) projecting laterally from opposite sides of said main portion (4) and transversely on said forming path (B);

It is characterized in that said interacting part of said folding mechanism (24, 25, 26) comprises a first elongated guide part (44) facing said conveying segment (33, 35a, 36a), which Extending at the upstream portion of said forming path (B) and forming an opposing surface (S) converging towards said conveying section (33, 35a, 36a) and slidingly with each of said packs ( 3) fits said second end portion (6) flattening said second end portion (6).

4. A device as claimed in claim 3, characterized in that said first guide member (44) comprises a plurality of fixed parallel elongated members (45) which are arranged along the same path of said forming path (B). direction extension.

5. A device as claimed in claim 3 or 4, characterized in that the interacting parts of the folding mechanism (24, 25, 26) comprise:

A pair of fixed first opposing members (56), which are defined by elongated segments, are located downstream of said first guide member (44) along said forming path (B) relative to said conveying section ( 33, 35a, 36a) and facing the opposite lateral edges (51) of the conveying segments (33, 35a, 36a); and

a pair of fixed second opposing members (50) defined by elongate segments and located adjacent respective said lateral edges (51) of said delivery segments (33, 35a, 36a); said first and said second opposing member (56, 50) correspondingly engages said second end portion (6) and said first end portion (7) of each said package (3) in a sliding manner, to fold the corresponding folded portions (15, 16).

6. A device as claimed in claim 5, characterized in that said first opposing member (56) defines a corresponding arm of a substantially U-shaped second guide member (55), which second guide member (55) comprising a connecting portion (57) perpendicular to said forming path (B) and connecting the respective downstream ends of the first opposing member (56); said folding mechanism (24, 25, 26) The interaction part comprises a forming roller (58), which roller is arranged between said first opposing part (56), has an axis perpendicular to said forming path (B), and has opposite end surfaces (59) facing said first opposing part (56) and defining together with said first opposing part (56) a respective seat, each said folded part (15) of said package (3) ) just slide in the seat.

7. A device as claimed in claim 6, characterized in that said first relative member (56) comprises along said forming path (B): a first guide portion (60) which is positioned relative to said conveying part Segments (33, 35a, 36a) diverge and converge with each other so that the corresponding folded portions (15) of each of said packages (3) rotate toward each other; the second guide portions (61) parallel to and parallel to said conveying segments (33, 35a, 36a), and facing the respective said end surfaces (59) of said forming rollers (58), so that said folded portion (15) is held in on said end surface (59); a third guide portion (62), parallel to said conveying segments (33, 35a, 36a) and converging towards each other, so as to direct towards said The second end portion (6) folds the folded portion (15); and the fourth guide portion (63), parallel to each other and to the conveying segments (33, 35a, 36a), so that the folded portion (15) remain in the position taken at the output of said third guide part (62); said connection part (57) of said second guide part (55) is in sliding manner with each of said packages ( 3) the corresponding said folded portion (15) cooperates so that the folded portion (15) is in contact with said second end portion (6) of the package (3).

8. A device as claimed in any one of claims 5 to 7, characterized in that said second opposing members (50) are parallel to each other and each comprise a conveyor section (33, 35a) , 36a), a straight middle portion (52), a curved upstream portion (53) extending from said middle portion (52) toward the curved downstream portion (54) of the intermediate portion (52) extending towards said second guide member (55); said upstream portion (53) of said second opposing member (50) in a sliding manner with each of said Said first end portion (7) of the package (3) fits so that the corresponding said folded portion (16) faces the corresponding opposite said the wall (11) rotates; and said downstream portion (54) of said second opposing member (50) engages in a sliding manner with a corresponding said folded portion (16) of each said package (3), so that The folded portion (16) is brought into contact with the corresponding said wall (11) of said main portion (4) of the package (3).

9. A device according to any one of the preceding claims 2 to 8, characterized in that it comprises a pair of fixed side portions (64) for laterally holding said package (3), which are arranged on on opposite sides of said delivery segment (33, 35a, 36a) and extends between said supply station (22) and said final pressing mechanism (28).

10. A device as claimed in claim 8 or 9, characterized in that said heating mechanism (27) comprises: an air heating assembly (65); a pair of first nozzles (66), connected to said heating assembly (65) and arranged between the fourth guide part (63) of the first opposing part (56), so as to reach the connecting part (57) of the second guide part (55) at the folded part (15) before introducing hot air onto the corresponding said folded portion (15) in each of said packages (3); and a pair of second nozzles (67), connected to said heating assembly (65) and arranged on between said middle portion (52) of said second opposing member (50) so as to direct hot air before the folded portion (16) reaches said downstream portion (54) of said second opposing member (50) onto the respective said folded portion (16) of each said package (3).

11. A device according to any one of claims 2 to 10, characterized in that the interacting parts of said final pressing mechanism (28) comprise three endless belts (70, 71, 72), their positioned at an angle of 90° to each other, between them and together with said conveying segments (33, 35a, 36a) form a forming channel (P1) having a constant rectangular surface and delimiting said finished packages ( 2) Shape.

12. 11. A device as claimed in claim 11, characterized in that each of said belts (70, 71, 72) is mounted on a corresponding pair of wheels (73).

13. A device as claimed in claim 11 or 12, characterized in that said first (70) and second (71) belts are arranged on opposite sides of said conveying section (33, 35a, 36a) side, and includes corresponding action segments (74, 75) facing said conveying segments (33, 35a, 36a); while the third (72) said belt includes an action segment (76), which A section (76) is perpendicular to said active section (74, 75) of said first and second belts (70, 71 ) and faces and is parallel to said conveying section (33, 35a, 36a).

14. 13. Apparatus as claimed in claim 13, characterized in that at least one (72) of said belts (70, 71, 72) comprises a plurality of equidistantly spaced first engaging members (78), when said When the conveyor belt (21) advanced, these first engaging parts (78) could be disengaged and engaged with the second engaging parts (79) on the corresponding said pushing parts (32), so that the movement of the belt (72) was consistent with The conveying segments (33, 35a, 36a) of the conveyor (21) are synchronized.

15. 14. A device as claimed in claim 14, characterized in that said first engaging members comprise corresponding elongated projections (78) which are perpendicular to said forming path (B) protruding from said third belt (72); said second engaging members include corresponding elongated openings (79) formed in the free openings of corresponding said pushing members (32) on the end edge.

16. A device according to any one of claims 13 to 15, characterized in that the third belt (72) includes a plurality of shaped protrusions (77) along the outside, and they slide in a sliding manner. Cooperating with the corresponding said folded portion (15) of each said package (3), the folded portion (15) is pressed against said second end portion (6) of the package (3) and defines corresponding substantially flat or concave walls of said finished package (2).